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116 changes: 116 additions & 0 deletions
116
src/main/java/com/refactify/printer/SqlFormattingWriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package com.refactify.printer; | ||
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| import java.io.IOException; | ||
| import java.io.Writer; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| public class SqlFormattingWriter extends Writer { | ||
| private static final String WHITESPACE = " \n\r\f\t"; | ||
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| private final Writer delegate; | ||
| private final StringBuilder buffer; | ||
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| public SqlFormattingWriter(Writer delegate) { | ||
| this.delegate = delegate; | ||
| this.buffer = new StringBuilder(); | ||
| } | ||
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| @Override | ||
| public void write(char[] cbuf, int off, int len) throws IOException { | ||
| for (int i = off; i < off + len; i++) { | ||
| char c = cbuf[i]; | ||
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| if (buffer.length() == 0 && WHITESPACE.indexOf(c) > -1) { | ||
| delegate.write(c); | ||
| } else { | ||
| buffer.append(c); | ||
| if (c == ';') { | ||
| flushSql(); | ||
| } | ||
| } | ||
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| } | ||
| } | ||
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| @Override | ||
| public void flush() throws IOException { | ||
| delegate.flush(); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| if (buffer.length() > 0) { | ||
| delegate.write(buffer.toString()); | ||
| buffer.setLength(0); | ||
| } | ||
| delegate.close(); | ||
| } | ||
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| private void flushSql() throws IOException { | ||
| String unformatted = buffer.toString(); | ||
| String formatted = formatSql(unformatted); | ||
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| delegate.write(formatted); | ||
| buffer.setLength(0); | ||
| } | ||
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| private String formatSql(String unformatted) { | ||
| if (!unformatted.startsWith("CREATE TABLE")) { | ||
| return unformatted; | ||
| } | ||
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| StringBuilder formatted = new StringBuilder(); | ||
| int openParen = unformatted.indexOf('('); | ||
| formatted.append(unformatted.substring(0, openParen + 1)); | ||
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| int closeParen = unformatted.lastIndexOf(')'); | ||
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| String tableDef = unformatted.substring(openParen + 1, closeParen); | ||
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| formatted.append('\n'); | ||
| for (String line : splitLines(tableDef)) { | ||
| formatted.append(" ").append(line).append("\n"); | ||
| } | ||
|
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| formatted.append(')'); | ||
| // force a space after the close paren | ||
| if (unformatted.charAt(closeParen + 1) != ' ') { | ||
| formatted.append(' '); | ||
| } | ||
| formatted.append(unformatted.substring(closeParen + 1)); | ||
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| return formatted.toString(); | ||
| } | ||
|
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| // don't split enum defs onto separate lines | ||
| private List<String> splitLines(String tableDef) { | ||
| List<String> lines = new ArrayList<>(); | ||
| StringBuilder currentLine = new StringBuilder(); | ||
| int openParens = 0; | ||
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| for (char c : tableDef.toCharArray()) { | ||
| if (currentLine.length() == 0 && WHITESPACE.indexOf(c) > -1) { | ||
| continue; | ||
| } | ||
|
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| currentLine.append(c); | ||
|
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| if (c == '(') { | ||
| openParens++; | ||
| } else if (c == ')') { | ||
| openParens--; | ||
| } else if (c == ',' && openParens == 0) { | ||
| lines.add(currentLine.toString()); | ||
| currentLine = new StringBuilder(); | ||
| } | ||
| } | ||
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| if (currentLine.length() > 0) { | ||
| lines.add(currentLine.toString()); | ||
| currentLine = null; | ||
| } | ||
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| return lines; | ||
| } | ||
| } |
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